This analysis quantifies relationships between SPCC 1.0 Refined Smoothed Roadway Segments and flood hazard areas identified in FEMA’s Flood Insurance Rate Map (FIRM). For this analysis, FIRM GIS data for the state of Florida were obtained from the FGDL data repository in March 2021. This analysis identified the floodplain of each roadway segment using the roadway centerline’s relationship to FIRM polygons.
The following table and charts present the presence of the five FEMA floodplain classifications for each SPCC 1.0 Refined Smoothed classification.
| SPCC 1.0 | 100-Year Floodplain | 500-Year Floodplain | Open Water | Outside Floodplain | Undetermined |
|---|---|---|---|---|---|
| C1 - Natural | 578,930 | 29,462 | 1,225 | 1,286,851 | 304,946 |
| C2 - Rural | 547,684 | 50,376 | NA | 2,000,444 | 105,457 |
| C3C- Suburban Commercial | 375,450 | 306,268 | NA | 1,817,626 | NA |
| C3R - Suburban Residential | 913,531 | 1,002,877 | NA | 4,578,678 | 62,882 |
| C4 - Urban General | 963,239 | 1,795,710 | NA | 3,401,447 | NA |
| C5 - Urban Center | 33,538 | 38,217 | NA | 56,099 | NA |
| C6 - Urban Core | 28,926 | 24,474 | NA | 27,932 | NA |
| Special District | 15,231 | 7,362 | NA | 46,193 | NA |
The following table presents the same data as above, but instead of absolute linear feet of roadway per quantile, the table provides the percent breakdown of all floodplain classifications across each SPCC category.
|
SPCC 1.0
|
0-Vehicle Household Density Quantile - Percent
|
||||
|---|---|---|---|---|---|
| SPCC 1.0 | 100-Year Floodplain | 500-Year Floodplain | Open Water | Outside Floodplain | Undetermined |
| C1 - Natural | 26.3% | 1.3% | 0.1% | 58.5% | 13.9% |
| C2 - Rural | 20.3% | 1.9% | NA | 74.0% | 3.9% |
| C3C- Suburban Commercial | 15.0% | 12.3% | NA | 72.7% | NA |
| C3R - Suburban Residential | 13.9% | 15.3% | NA | 69.8% | 1.0% |
| C4 - Urban General | 15.6% | 29.1% | NA | 55.2% | NA |
| C5 - Urban Center | 26.2% | 29.9% | NA | 43.9% | NA |
| C6 - Urban Core | 35.6% | 30.1% | NA | 34.3% | NA |
| Special District | 22.1% | 10.7% | NA | 67.2% | NA |